import fetch from 'dva/fetch';
import { notification } from 'antd';
import { routerRedux } from 'dva/router';
import { getAuthority, setAuthority } from '../utils/authority';
import { unAuthUrl, token } from '../utils/Constant'
import store from '../index';


const codeMessage = {
  200: '服务器成功返回请求的数据。',
  201: '新建或修改数据成功。',
  202: '一个请求已经进入后台排队（异步任务）。',
  204: '删除数据成功。',
  400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
  401: '用户没有权限（令牌、用户名、密码错误）。',
  403: '用户得到授权，但是访问是被禁止的。',
  404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
  406: '请求的格式不可得。',
  410: '请求的资源被永久删除，且不会再得到的。',
  422: '当创建一个对象时，发生一个验证错误。',
  500: '服务器发生错误，请检查服务器。',
  502: '网关错误。',
  503: '服务不可用，服务器暂时过载或维护。',
  504: '网关超时。',
};
function checkStatus(response) {
  if ((response.status >= 200 && response.status < 300) || response.status === 501) {
    return response;
  }
  if(response.status === 401){
    window.location.href = unAuthUrl;
    return response;
  }
  const errortext = codeMessage[response.status] || response.statusText;
  notification.error({
    message: `请求错误 ${response.status}: ${response.url}`,
    description: errortext,
  });
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, options) {
  const defaultOptions = {
    credentials: 'include',
  };
  const newOptions = { ...defaultOptions, ...options };
  newOptions.headers = {
    token: getAuthority() ? getAuthority(): token,
    ...newOptions.headers,
  };

  if (
    newOptions.method === 'POST' ||
    newOptions.method === 'PUT' ||
    newOptions.method === 'DELETE'
  ) {
    if (!(newOptions.body instanceof FormData)) {
      newOptions.headers = {
        Accept: 'application/json',
        'Content-Type': 'application/json; charset=utf-8',
        ...newOptions.headers,
      };
      newOptions.body = JSON.stringify(newOptions.body);
    } else {
      // newOptions.body is FormData
      newOptions.headers = {
        Accept: 'application/json',
        ...newOptions.headers,
      };
    }
  }
  return fetch(url, newOptions)
    .then(checkStatus)
    .then(response => {
      const token = response.headers.get('token');
      if (token) {
        setAuthority(token);
      }
      return response.json();
    })
    .catch(e => {
      store.then(data => {
        const { dispatch } = data;
        const status = e.name;
        /*if (status === 401) {
          window.location.href = 'http://47.114.184.115/login/#/login';
          return;
        }*/

        if (status === 403) {
          dispatch(routerRedux.push('/exception/403'));
          return;
        }
        if (status <= 504 && status >= 500) {
          dispatch(routerRedux.push('/exception/500'));
          return;
        }
        if (status >= 404 && status < 422) {
          dispatch(routerRedux.push('/exception/404'));
        }
      });
    });
}
